How do I find the MySQL my.cnf location
Is there a MySQL command to locate the my.cnf configuration file, similar to how PHP's phpinfo() locates its php.ini?
Answer
There is no internal MySQL command to trace this, it's a little too abstract. The file might be in 5 (or more?) locations, and they would all be valid because they load cascading.
- /etc/my.cnf
- /etc/mysql/my.cnf
- $MYSQL_HOME/my.cnf
- [datadir]/my.cnf
- ~/.my.cnf
Those are the default locations MySQL looks at. If it finds more than one, it will load each of them & values override each other (in the listed order, I think). Also, the --defaults-file parameter can override the whole thing, so... basically, it's a huge pain in the butt.
But thanks to it being so confusing, there's a good chance it's just in /etc/my.cnf.
(if you just want to see the values: SHOW VARIABLES, but you'll need the permissions to do so.)